Frankfurt 2006 – scientific programme

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A: Atomphysik

A 20: Poster II: Atomare Systeme in starken Laserpulsen und statischen Feldern

A 20.1: Poster

Thursday, March 16, 2006, 16:30–18:30, Labsaal

Relativistic classical and quantum dynamics in intense crossed laser beams — •M. Verschl and C. H. Keitel — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

The dynamics of an electron in crossed laser fields is investigated analytically. Two different standing wave configurations are considered which have the property that they posses certain axes where the Lorentz force of the magnetic field vanishes. If the electron moves along these axes, the electron drift which occurs in strong single laser beams [1] is avoided. This is useful because the drift motion reduces the effectiveness of recollision processes in atomic systems [2].

The laser configurations are given by two counter-propagating waves that are linearly polarized in the first and circularly polarized in the second case.

Depending on the laser field strength different approaches are implemented to describe the electron wave packet. In the non-relativistic limit the electron dynamics can be described quantum mechanically. Relativistic effects are discussed by considering the lowest order relativistic correction term of the Klein-Gordon equation. A fully relativistic description is given by a classical wave packet approach. Significant differences of the two configurations are shown to appear only in the relativistic regime.

[1] M. Verschl, C.H. Keitel,
Laser Physics 15, 529-535 (2005)

[2] D.B. Milosevic, F. Ehlotzky,
Advances in Atomic, Molecular and Optical Physics 49, 373-532 (2003)